Search results
1 – 10 of 105Michael V. Gangone, Matthew J. Whelan, Kerop D. Janoyan and Levon Minnetyan
The purpose of this paper is to further validate a wireless sensor system developed at Clarkson University for structural monitoring of highway bridges. The particular bridge…
Abstract
Purpose
The purpose of this paper is to further validate a wireless sensor system developed at Clarkson University for structural monitoring of highway bridges. The particular bridge monitored employs a fiber reinforced polymer (FRP) panel system which is fairly innovative in the field of civil engineering design. The superstructure was monitored on two separate occasions to determine a change in structural response and see how the structural system performs over time.
Design/methodology/approach
A series of wireless sensor units was deployed at various locations of the steel superstructure, to measure both the modal response from acceleration measurements as well as quasi‐static and dynamic strain response. Ambient and forced loading conditions were applied to measure the response. Data results were compared over two separate periods approximately nine months apart.
Findings
The first eight mode shapes were produced from output‐only system identification providing natural frequencies ranging from approximately 6 to 42 Hz. The strain response was monitored over two different testing periods to measure various performance characteristics. Neutral axis, distribution factor, impact factor and end fixity were determined. Results appeared to be different over the two testing periods. They indicate that the load rating of the superstructure decreased over the nine month period, possibly due to deterioration of the materials or composite action.
Research limitations/implications
The results from the two testing periods indicate that further testing needs to be completed to validate the change in response. It is difficult to say with certainty that the significant change in response is due to bridge deterioration and not other factors such as temperature effects on load rating. The sensor system, however, proved to provide high quality data and responses indicating its successful deployment for load testing and monitoring of highway infrastructure.
Originality/value
The paper provides a depiction of the change in structural behavior of a bridge superstructure using a wireless sensor system. The wireless system provided high‐rate data transmission in real time. Load testing at two different points in time, eight months apart, showed a significant change in bridge behavior. The paper provides a practical and actual physical load test and rating during these two periods for quantifiable change in response. It is shown that the wireless system is capable of infrastructure monitoring and that possible deterioration is expected with this particular bridge design. Additionally, the load testing occurred during different seasons, which could create cause for temperature effects in load rating. This can provide a basis for future performance monitoring techniques and structural health monitoring.
Details
Keywords
As a movement for alternative means of food production and consumption has grown, so, too, have civic efforts to make alternative food accessible to low-income persons (LIPs)…
Abstract
Purpose
As a movement for alternative means of food production and consumption has grown, so, too, have civic efforts to make alternative food accessible to low-income persons (LIPs). This article examines the impact of alternative food institutions (AFIs) on low-income communities in the United States and Canada, focusing on research published since 2008.
Methodology/approach
Through a three-stage literature search, I created a database of 110 articles that make empirical or theoretical contributions to scholarly knowledge on the relationship of AFIs to low-income communities in North America. I used an in vivo coding scheme to categorize the impacts that AFIs have on LIPs and to identify predominant barriers to LIPs’ engagement with AFIs.
Findings
The impacts of AFIs span seven outcome categories: food consumption, food access and security, food skills, economic, other health, civic, and neighborhood. Economic, social and cultural barriers impede LIPs’ engagement with AFIs. AFIs can promote positive health outcomes for low-income persons when they meet criteria for affordability, convenience and inclusivity.
Implications
This review exposes productive avenues of dialogue between health scholars and medical sociology and geography/environmental sociology. Health scholarship offers empirical support for consumer-focused solutions. Conversely, by constructively critiquing the neoliberal underpinnings of AFIs’ discourse and structure, geographers and sociologists supply health scholars with a language that may enable more systemic interventions.
Originality/value
This article is the first to synthesize research on five categories of alternative food institutions (farmers’ markets, CSAs, community gardens, urban farms, and food cooperatives) across disciplinary boundaries.
Details
Keywords
Karlijn Massar, Annika Nübold, Robert van Doorn and Karen Schelleman-Offermans
There is an abundance of empirical evidence on the positive effects of employment – and the detrimental effects of unemployment – on individuals’ psychological and physical health…
Abstract
There is an abundance of empirical evidence on the positive effects of employment – and the detrimental effects of unemployment – on individuals’ psychological and physical health and well-being. In this chapter, the authors explore whether and how self-employment or entrepreneurship could be a solution for individuals’ (re)entry to the job market and which (psychological) variables enhance the likelihood of entrepreneurial success. Specifically, the authors first focus on unemployment and its detrimental effects for health and wellbeing, and outline the existing interventions aimed at assisting reemployment and combating the negative consequences of unemployment for individuals’ well-being. Then, the authors will explore entrepreneurship as a potential solution to unemployment and explore the psychological variables that enhance the likelihood of entrepreneurial success. One of the variables the authors highlight as particularly relevant for self-employment is the second-order construct of Psychological Capital (PsyCap; Luthans, Avolio, Avey, & Norman, 2007), as well as its individual components – hope, optimism, efficacy, and resilience. PsyCap is a malleable construct that can be successfully trained, and PsyCap interventions are inherently strength-based and have positive effects on employees’ and entrepreneurs’ performance and wellbeing. Therefore, the authors end the chapter by suggesting that a PsyCap component in existing education and training programs for entrepreneurship is likely to not only increase entrepreneurial intentions and success, but also increases participants’ well-being, self-esteem, and the general confidence they can pick up the reigns and take back control over their (professional) lives.
Details
Keywords
This chapter provides a review and extension of research pertaining to the respective roles of leaders, managers, and human resource management (HRM) practices on employee…
Abstract
This chapter provides a review and extension of research pertaining to the respective roles of leaders, managers, and human resource management (HRM) practices on employee reactions to organizational change. Particular focus is given to the differential effects of these factors on employee commitment and resistance to change. A review of organizational change research between 2001 and 2011 revealed these outcomes to be two of the most commonly studied and consequential employee reactions to change. The review also demonstrates that research lacks precision in the treatment (conceptualization and measurement) of these constructs. For instance, sometimes the leadership and management of change are clearly differentiated, other times equated, and yet other times blurred. Arguments are presented that encourage researchers to refine theory and tests of leading and managing change, as well as their respective implications for change-related HRM. A specific case is made for the academic and practical utility of theory and practice that explicitly integrates leadership and management roles and responsibilities. Doing so will more closely align with and capture the inherent complexity of organizational change and employees’ experience. The intent is to urge both scholars and practitioners of change to adopt broader, yet more precise and practical, perspectives on how to influence employee reactions and change outcomes. To this end, special attention is paid to roles of leaders, managers, and HRM practices.
Anna Marie Johnson and Sarah Jent
Sets out to provide a selected bibliography or recent resources on library instruction and information literacy.
Abstract
Purpose
Sets out to provide a selected bibliography or recent resources on library instruction and information literacy.
Design/methodology/approach
Introduces and annotates periodical articles, monographs, and exhibition catalogues examining library instruction and information literacy.
Findings
Provides information about each source, discusses the characteristics of current scholarship, and describes sources that contain unique scholarly contributions and quality reproductions.
Originality/value
The information may be used by librarians and interested parties as a quick reference to literature on library instruction and information literacy.
Details